diff --git a/tests/async_engine/test_api_server.py b/tests/async_engine/test_api_server.py
index 77f3fb0025a0f..9638b49303b58 100644
--- a/tests/async_engine/test_api_server.py
+++ b/tests/async_engine/test_api_server.py
@@ -98,7 +98,7 @@ def test_api_server(api_server, tokenizer_pool_size: int,
 
         # check cancellation stats
         # give it some times to update the stats
-        time.sleep(1)
+        time.sleep(3)
 
         num_aborted_requests = requests.get(
             "http://localhost:8000/stats").json()["num_aborted_requests"]